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diff --git a/chromium/net/proxy/proxy_resolver_v8.h b/chromium/net/proxy/proxy_resolver_v8.h
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+++ b/chromium/net/proxy/proxy_resolver_v8.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_PROXY_PROXY_RESOLVER_V8_H_
+#define NET_PROXY_PROXY_RESOLVER_V8_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/net_export.h"
+#include "net/proxy/proxy_resolver.h"
+
+namespace v8 {
+class HeapStatistics;
+class Isolate;
+}  // namespace v8
+
+namespace net {
+
+// Implementation of ProxyResolver that uses V8 to evaluate PAC scripts.
+//
+// ----------------------------------------------------------------------------
+// !!! Important note on threading model:
+// ----------------------------------------------------------------------------
+// There can be only one instance of V8 running at a time. To enforce this
+// constraint, ProxyResolverV8 holds a v8::Locker during execution. Therefore
+// it is OK to run multiple instances of ProxyResolverV8 on different threads,
+// since only one will be running inside V8 at a time.
+//
+// It is important that *ALL* instances of V8 in the process be using
+// v8::Locker. If not there can be race conditions between the non-locked V8
+// instances and the locked V8 instances used by ProxyResolverV8 (assuming they
+// run on different threads).
+//
+// This is the case with the V8 instance used by chromium's renderer -- it runs
+// on a different thread from ProxyResolver (renderer thread vs PAC thread),
+// and does not use locking since it expects to be alone.
+class NET_EXPORT_PRIVATE ProxyResolverV8 : public ProxyResolver {
+ public:
+  // Interface for the javascript bindings.
+  class NET_EXPORT_PRIVATE JSBindings {
+   public:
+    enum ResolveDnsOperation {
+      DNS_RESOLVE,
+      DNS_RESOLVE_EX,
+      MY_IP_ADDRESS,
+      MY_IP_ADDRESS_EX,
+    };
+
+    JSBindings() {}
+
+    // Handler for "dnsResolve()", "dnsResolveEx()", "myIpAddress()",
+    // "myIpAddressEx()". Returns true on success and fills |*output| with the
+    // result. If |*terminate| is set to true, then the script execution will
+    // be aborted. Note that termination may not happen right away.
+    virtual bool ResolveDns(const std::string& host,
+                            ResolveDnsOperation op,
+                            std::string* output,
+                            bool* terminate) = 0;
+
+    // Handler for "alert(message)"
+    virtual void Alert(const base::string16& message) = 0;
+
+    // Handler for when an error is encountered. |line_number| may be -1
+    // if a line number is not applicable to this error.
+    virtual void OnError(int line_number, const base::string16& error) = 0;
+
+   protected:
+    virtual ~JSBindings() {}
+  };
+
+  // Constructs a ProxyResolverV8.
+  ProxyResolverV8();
+
+  virtual ~ProxyResolverV8();
+
+  JSBindings* js_bindings() const { return js_bindings_; }
+  void set_js_bindings(JSBindings* js_bindings) { js_bindings_ = js_bindings; }
+
+  // ProxyResolver implementation:
+  virtual int GetProxyForURL(const GURL& url,
+                             ProxyInfo* results,
+                             const net::CompletionCallback& /*callback*/,
+                             RequestHandle* /*request*/,
+                             const BoundNetLog& net_log) OVERRIDE;
+  virtual void CancelRequest(RequestHandle request) OVERRIDE;
+  virtual LoadState GetLoadState(RequestHandle request) const OVERRIDE;
+  virtual void CancelSetPacScript() OVERRIDE;
+  virtual void PurgeMemory() OVERRIDE;
+  virtual int SetPacScript(
+      const scoped_refptr<ProxyResolverScriptData>& script_data,
+      const net::CompletionCallback& /*callback*/) OVERRIDE;
+
+  // Remember the default Isolate, must be called from the main thread. This
+  // hack can be removed when the "default Isolate" concept is gone.
+  static void RememberDefaultIsolate();
+
+#if defined(OS_WIN)
+  // Create an isolate to use for the proxy resolver. Until the "default
+  // Isolate" concept is gone, it is preferable to invoke
+  // RememberDefaultIsolate() as creating a new Isolate in additional to the
+  // default Isolate will waste a few MB of memory and the runtime it took to
+  // create the default Isolate.
+  static void CreateIsolate();
+#endif
+
+  static v8::Isolate* GetDefaultIsolate();
+
+  // Get total/ued heap memory usage of all v8 instances used by the proxy
+  // resolver.
+  static size_t GetTotalHeapSize();
+  static size_t GetUsedHeapSize();
+
+ private:
+  static v8::Isolate* g_default_isolate_;
+
+  // Context holds the Javascript state for the most recently loaded PAC
+  // script. It corresponds with the data from the last call to
+  // SetPacScript().
+  class Context;
+
+  scoped_ptr<Context> context_;
+
+  JSBindings* js_bindings_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8);
+};
+
+}  // namespace net
+
+#endif  // NET_PROXY_PROXY_RESOLVER_V8_H_